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Unlocking Novel Functionality:Pseudocapacitive Sensing in MXene-Based Flexible Supercapacitors

Nano-Micro Letters 2025年第4期17卷 212-229页

作者： Eunji Kim Seongbeen Kim Hyeong Min Jin Gyungtae Kim Hwi-Heon Ha Yunhui Choi Kyoungha Min Su-Ho Cho Hee Han Chi Won Ahn Jaewoo Roh Il-Kwon Oh Jinwoo Lee Yonghee Lee Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea National Nano Fab Center(NNFC) 291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea Department of Organic Materials Engineering Chungnam National University99 Daehak-RoYuseong-GuDaejeon 34134Republic of Korea Department of Materials Science and Engineering Chungnam National University99 Daehak-RoYuseong-GuDaejeon 34134Republic of Korea Department of Nano&Advanced Materials Science and Engineering Kyungpook National University2559Gyeongsang-DaeroSangju-SiGyeongsangbuk-Do 37224Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea

Extensively explored for their distinctive pseudocapacitance characteristics,MXenes,a distinguished group of 2D materials,have led to remarkable achievements,particularly in the realm of energy storage *** work presents an innovative Pseudocapacitive *** key lies in switching the energy storage kinetics from pseudocapacitor to electrical double layer capacitor by employing the change of local pH(-log[H^(+)])in MXene-based flexible supercapacitors during *** sensing is observed in acidic electrolyte but absent in neutral *** shearing during bending causes liquid-crystalline MXene sheets to increase in their degree of anisotropic *** blocking of H+mobility due to the higher diffusion barrier,local pH *** electrochemical energy storage kinetics transits from Faradaic chemical protonation(intercalation)to non-Faradaic physical *** utilize the phenomenon of capacitance change due to shifting energy storage kinetics for strain sensing *** developed highly sensitive Pseudocapacitive Sensors feature a remarkable gauge factor(GF)of approximately 1200,far surpassing conventional strain sensors(GF:~1 for dielectric-cap sensor).The introduction of the Pseudocapacitive Sensor represents a paradigm shift,expanding the application of pseudocapacitance from being solely confined to energy devices to the realm of multifunctional *** technological leap enriches our understanding of the pseudocapacitance mechanism of MXenes,and will drive innovation in cutting-edge technology areas,including advanced robotics,implantable biomedical devices,and health monitoring systems.

关键词： MXenes Supercapacitors Pseudocapacitive sensing Local pH Operando measurements

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Accurate prediction of oxygen vacancy concentration with disordered A-site cations in high-entropy perovskite oxides

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npj Computational materials 2023年第1期9卷 2053-2065页

作者： Jiyun Park Boyuan Xu Jie Pan Dawei Zhang Stephan Lany Xingbo Liu Jian Luo Yue Qi School of Engineering Brown UniversityProvidenceRI 02912USA Department of Physics Brown UniversityProvidenceRI 02912USA Department of Chemical Engineering and Materials Science Michigan State UniversityEast LansingMI 48824USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA Materials Science Center National Renewable Energy LaboratoryGoldenCO 80401USA Department of Mechanical and Aerospace Engineering Benjamin M.Statler College of Engineering and Mineral ResourcesWest Virginia UniversityMorgantownWV 26506USA Department of NanoEngineering University of California San DiegoLa JollaCA 92093USA

Entropic stabilized ABO_(3) perovskite oxides promise many applications,including the two-step solar thermochemical hydrogen(STCH)*** binary and quaternary A-site mixed{A}FeO_(3) as a model system,we reveal that as more cation types,especially above four,are mixed on the A-site,the cell lattice becomes more cubic-like but the local Fe–O octahedrons are more *** comparing four different Density Functional Theory-informed statistical models with experiments,we show that the oxygen vacancy formation energies(E^(f)_(V))distribution and the vacancy interactions must be considered to predict the oxygen non-stoichiometry(δ)*** STCH applications,the E^(f)_(V) distribution,including both the average and the spread,can be optimized jointly to improveΔδ(difference ofδbetween the two-step conditions)in some hydrogen production *** model can be used to predict the range of water splitting that can be thermodynamically improved by mixing cations in{A}FeO_(3) perovskites.

关键词： perovskite vacancy oxides

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Low-frequency and dual-band microwave absorption properties of novel VB-group disulphides(3R–TaS_(2))nanosheets

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Nano materials science 2024年第5期6卷 635-646页

作者： Liquan Fan Honglin Ai Meiye Jiao Yao Li Yongheng Jin Yiru Fu Jing Wang Yuwei Wang Deqing Zhang Guangping Zheng Junye Cheng College of Materials Science and Engineering Heilongjiang Provincial Key Laboratory of Polymeric Composite MaterialsQiqihar UniversityNo.42Wenhua StreetQiqihar161006PR China Department of Materials Science Shenzhen MSU-BIT UniversityShenzhenGuangdong Province517182PR China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

As electromagnetic technology advances and demand for electronic devices grows,concerns about electromagnetic pollution *** has spurred focused research on innovative electromagnetic absorbers,particularly chalcogenides,noted for their superior absorption *** this study,we successfully synthesize 3R–TaS_(2)nanosheets using a straightforward calcination method for the first *** nanosheets exhibit significant absorption capabilities in both the C-band(4–8 GHz)and Ku-band(12–18 GHz)frequency *** optimizing the calcination process,the complex permittivity of TaS_(2)is enhanced,specifically for those synthesized at 1000℃for 24 *** nanosheets possess dual-band absorption properties,with a notable minimum reflection loss(RLmin)of41.4 dB in the C-band,and an average absorption intensity exceeding 10 dB in C-and Ku-bands,in the absorbers with a thickness of 5.6 ***,the 3R–TaS_(2)nanosheets are demonstrated to have an effective absorption bandwidth of 5.04 GHz(3.84–8.88 GHz)in the absorbers with thicknesses of 3.5–5.5 *** results highlight the multiple reflection effects in 3R–TaS_(2)as caused by their stacked structures,which could be promising low-frequency absorbers.

关键词： 3R-TaS_(2) Nanosheets Electromagnetic wave absorption Reflection loss

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Application of SiC and Graphite reinforced Aluminium Metal Matrix Composite in Braking Systems and its Validation Through Finite Element Analysis

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Journal of The Institution of Engineers (India): Series D 2023年第2期104卷 449-464页

作者： Chatterjee, Arpita Sen, Soumyadeep Paul, Subhodeep Roy, Pallab Sutradhar, Goutam Ghosh, Manojit Department of Mechanical Engineering Dr. Sudhir Chandra Sur Institute of Technology and Sports Complex Kolkata India Department of Mechanical Engineering National Institute of Technology Manipur Imphal India Department of Mechanical Engineering Budge Budge Institute of Technology Kolkata India Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and Technology Shibpur Howrah India

Smooth and efficient braking has always been a crucial factor to influence the efficiency of an automobile. This factor has prompted several researchers to indulge in the never-ending chase for a constant development and innovation in the domain of braking systems. Recent progress in this field is evident from the implementation of the new disc brake systems replacing the conventionally used drum type brakes. However, the conventionally existing disc braking systems are continuously exposed to the significant thermal and mechanical stresses that causes structural deformation, overheating, thermal cracking, and squeals of the rotor, which pose a threat to the lifetime and future performance of the rotor pads. Generally, in industrial automobiles, grey cast iron is used as rotor material since it exhibits positive results to thermal and mechanical loads, however investigations demonstrated that superior results can be obtained using other materials as well. Hence in the present study, an attempt to use SiC/Graphite reinforced Aluminium alloy (LM6) as an efficient alternative has been made. Consequently, the performance of the fabricated material was initially estimated through several thermal and mechanical investigations of tensile tests, compression tests, thermal conductivity, thermo-mechanical analysis and differential scanning calorimetry. Moreover, with an intention to validate the experimental observations, and to predict the real-life performance, finite element analysis on disc brake rotor of Maruti Alto 800 was conducted. The 3D model of the rotor was designed on Catia V5R20 using actual measurements of the disc brake prototype. This 3D model and measured parameters were used as an input feed for the accurate simulation of modal, structural and thermal behaviour in ANSYS 18.1 FEA software. The results of the experimentations were observed to be in good agreement with the simulation results, indicating the accuracy of the experimental predictions. © 2022, The

关键词： Differential scanning calorimetry

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Eggshell membrane: A proteinaceous template for the development of hierarchical ceramics

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Ceramics International 2025年第16期51卷 21135-21161页

作者： Sabu, Ummen Balaz, Matej Balasubramanian, M. Bordia, Rajendra K. Department of Mechanical Engineering National Institute of Technology Calicut Kozhikode673601 India Department of Mechanochemistry Institute of Geotechnics Slovak Academy of Sciences Watsonova 45 Košice04001 Slovakia Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai600036 India Department of Materials Science and Engineering Clemson University ClemsonSC29634 United States

Bioinspired synthesis utilizing natural materials is an emerging and fascinating route for scientists to develop inorganic materials with hierarchical structural features. Many plant and animal-based materials can be employed as bio-templates for structuring ceramics. Eggshell membrane (ESM), a protein-rich membrane found between the eggshell and egg white, has the potential for developing ceramic materials with hierarchical features, which are difficult to attain through other synthetic methods. The utility of ESM has long been underestimated and was often discarded as waste material. The ESM can act as a sustainable physical substrate and a functional macromolecular template, with the short-chained amino acids of glycoprotein functioning as a capping agent for controlling building unit growth during material synthesis. The first part of this review focuses on ESM's structure, morphology, chemical composition, and methods of separating it from the eggshell. The utilization of ESM as a bio-template for the synthesis of hierarchical ceramics that finds applications in various engineering fields is discussed in the second part. The focus is devoted to the preparation of biomorphic nanostructures. The review concludes with the future perspectives of ESM in the development of ceramic materials and the associated challenges. © 2025

关键词： Ceramic membranes

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Efficient Recycling of Magnesium Alloys via Partial Distillation Using Gravity-Multiple Effect Thermal System (G-METS)

Efficient Recycling of Magnesium Alloys via Partial Distilla...

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Magnesium Technology Symposium, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025

作者： McArthur Sehar, Daniel Saito, Kenichi Telgerafchi, Armaghan Gallego, Maya Sridhar, Meera Iurkovskyi, Artem Powell, Adam Department of Materials Science and Engineering Program Worcester Polytechnic Institute 100 Institute Rd. WorcesterMA01609 United States Department of Mechanical Engineering Shibaura Institute of Technology Tokyo Japan Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA United States

ISBN: (纸本)9783031810602

MagnesiumMagnesium’s remarkable stiffnessStiffness-to-weight and high strengthStrength-to-weight ratios could enable substantial vehicle lightweighting versus aluminum and steel. However, primary production is very energy- and emissions-intensive, and recyclingRecycling cannot cost-effectively produce magnesiumMagnesium of sufficient purity for die casting and other structural applications. Distillation can produce high-purity magnesiumMagnesium but is capital- and energy-intensive. Gravity-Driven Multiple Effect Thermal System (G-METS) is a continuous low-pressure magnesiumMagnesium distillation process used in primary production or recyclingRecycling in which heat re-use leads to just 0.5–1 kWh energy consumption per kgMg Mg product—which is 80–90% less energy than current Mg distillation. This paper presents new partial distillation experiments showing 99.96% product purity. An industrial distiller design can help to estimate capital costs. New modeling work describes temperature and pressure change in the vapor conduit, energy use and losses in the industrial distiller, and effects of evaporator flow vanes on the separation of volatile elements such as zinc. © The Minerals, Metals & materials Society 2025.

关键词： Magnesium alloys

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Planar structure of organic photodetector for low dark current

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Chinese Physics B 2025年第2期34卷 290-295页

作者： Mohammad Nofil Amirul Ashraf Md Sabri Fadlan Arif Natashah Tahani M Bawazeer Mohammad S Alsoufi Nur Adilah Roslan Azzuliani Supangat Low Dimensional Materials Research Centre Department of PhysicsFaculty of ScienceUniversiti MalayaKuala Lumpur50603Malaysia Department of Chemistry Faculty of Applied ScienceUmm Al-Qura UniversityMakkahSaudi Arabia Mechanical Engineering Department College of Engineering and Islamic ArchitectureUmm Al-Qura UniversityMakkahSaudi Arabia Department of Physics Faculty of ScienceUniversiti Putra MalaysiaSerdang43400Malaysia

The focus of this study is on investigating the vanadyl 2,9,16,23-tetraphenoxy-29H, 31H-phthalocyanine(VOPc Ph O)and its blend with o-xylenyl C60 bis-adduct(OXCBA), for use as a lateral ultraviolet organic photodetector. The research focuses on improving dark current reduction, which is a challenge in lateral organic photodetector. By integrating the OXCBA, low dark current values of 4.83 nA·cm^(-2)(D_(shot)^(*)= 1.414 × 10^(11)Jones) have been achieved as compared to the stand-alone VoPcPhO device of 14.06 nA·cm^(-2). The major contributing factors to dark current reduction are due to the efficient charge transfer at the photoactive-electrode interface, the deep highest occupied molecular orbital(HOMO)level of OXCBA, which leads to favorable energy level alignments hindering hole injection, and the occurrence of bulk heterojunction vertical phase segregation between VOPcPhO and OXCBA. These findings shed light on the relationship between the organic photoconductor's material composition, morphology, and performance metrics and open new avenues for metal phthalocyanine-based lateral ultraviolet organic photodetectors with low dark current and enhanced performance.

关键词： small molecule dark current ultra-violet(UV)sensor device physics

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Boosting bulk photovoltaic effect in transition metal dichalcogenide by edge semimetal contact

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Light(science & Applications) 2025年第1期14卷 197-205页

作者： Shuang Qiao Jihong Liu Chengdong Yao Ni Yang Fangyuan Zheng Wanqing Meng Yi Wan Philip C.Y.Chow Dong-Keun Ki Lijie Zhang Yumeng Shi Lain-Jong Li Hebei Key Laboratory of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei University071002BaodingChina Department of Mechanical Engineering The University of Hong KongHong KongChina Department of Physics and HK Institute of Quantum Science&Technology The University of Hong KongHong KongChina Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouChina Key Laboratory of Luminescence and Optical Information Ministry of EducationSchool of Physical Science and EngineeringBeijing Jiaotong University100044BeijingChina

Oxide materials with a non-centrosymmetric structure exhibit bulk photovoltaic effect(BPVE)but with a low cell *** the past few years,relatively larger BPVE coefficients have been reported for two-dimensional(2D)layers and stacks with asymmety-induced spontaneous ***,we report a crucial breakthrough in boosting the BPVE in 3R-MoS2 by adopting edge contact(EC)geometry using bismuth semimetal *** clear contrast to the typically used top contact(TC)geometry,the EC metal which strongly adheres to the edges and the subtrates can induce a pronounced tensile strain to the 3R-MoS2,and the lateral contact geometry allows to completely access to in-plane polarization from underneath layers reachable by light,leading to>100 times of BPVE enhancement in *** further design a 3R-MoS2/WSe2 heterojunction to demonstrate constructive coupling of BPVE with the conventional photovoltaic effect,indicating their potential in photodetectors and photovoltaic devices.

关键词： effect geometry breakthrough

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Printability,microstructures and mechanical properties of a novel Co-based superalloy fabricated via laser powder bed fusion

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Journal of materials science & Technology 2024年第22期189卷 96-109页

作者： Chuan Guo Zhen Xu Gan Li Jingchen Wang Xiaogang Hu Ying Li Xiaohan Chen Hui Liu Le Cheng Shiyu Zhong Qiang Zhu Jian Lu CityU-Shenzhen Futian Research Institute Shenzhen 518045China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering Shenyang National Laboratory for Materials ScienceGreater Bay Joint DivisionCity University of Hong KongTat Chee AvenueKowloonHong KongChina Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China

High levels of Al and Ti in superalloy compositions normally lead to cracking formation during the laser powder bed fusion process,while these elements are key constituents of strengthening *** the current study,a novel Co-based superalloy with the basic chemical composition of Co-Al-W-Ta-Ti resolved this contradiction,indicating that the part was formed without cracking and simultaneously contained a large amount of strengthening precipitates in the microstructure fabricated via laser powder bed *** printability,microstructures,and mechanical properties of the sample were analysed before and after heat treatment,providing a potential superalloy that can replace Ni-based superalloys fabricated by additive manufacturing in aerospace and other industries with higher temperature and more efficiency.

关键词： Co-based superalloy Laser powder bed fusion Printability Microstructure mechanical properties

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Design of A Novel Statically Balanced Mechanism for End-effector-type Upper Limb Assistance

Design of A Novel Statically Balanced Mechanism for End-effe...

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2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Meng, Qizhi Jiang, Ming Tang, Ruijie Kuo, Chin-Hsing Ceccarelli, Marco Takeda, Yukio Institute of Science Tokyo Department of Mechanical Engineering Tokyo Japan Tsinghua University Department of Mechanical Engineering Beijing China School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Australia University of Rome Tor Vergata Department of Industrial Engineering Rome Italy

ISBN: (纸本)9798331533892

Partial loss of upper limb motor function is a typical sequela of stroke. To help such patients actively cope with daily challenges and improve their quality of life, limb functional assistances play important roles. To this end, this paper proposes a three-degree-of-freedom parallel mechanism, which can be used for human upper limb assistance. The base of the proposed mechanism is a circular track that can be attached to the waist of the human body. The mechanism consists of two chains containing parallelogram linkage, which presents good constraints for the mobile platform and facilitates the static balance design by adding springs, thereby providing reliable assistive functions and lightweight portability. The mobility of the proposed mechanism is analyzed via the screw theory, and it is verified that the mechanism generates the aimed movements. Then, the kinematic analysis of the mechanism is presented. Finally, the static balance design is carried out in detail, and the spring constants of the three added springs are calculated. The result shows that the mechanism can achieve perfect static balance. The proposed mechanism is expected to provide a potential candidate for assistive devices and be developed into a prototype providing upper limb assistance. © 2025 IEEE.

关键词： End effectors

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